Pet safety answer · Cited to ASPCA
Is Hyacinth safe for cats?
Why it's toxic
Toxic principles: Possibly narcissus-like alkaloids
Clinical signs in cats: Intense vomiting, diarrhea, occassionally with blood, depression and tremors.
Severity rating: severe
Source
Classification per the ASPCA Toxic and Non-Toxic Plants database entry for Hyacinth. Verified 2026-05-28. We update these answers when the source changes the classification.